Where is the N'Golo Kante of last year?

For Arsenal's third, it was Chelsea's dogged, terrier-like holding man who lost the ball to Mesut Ozil.

Nothing got past N'Golo Kante last season.

Here he watched it trickle away, before breaking into a genteel jog, and watching the ball go in the net.

This man was the best midfielder in England a year ago.

He's very far from it now, and Chelsea are really feeling that.

Conte's subs are still a mystery

Cesc Fabregas of Chelsea is frustrated after Arsenal score again

No switches at half time – again – to the disbelief of most.

But the changes came, and much earlier than we've seen all season.

But taking off Cesc Fabregas , at Arsenal, to bring on Marcos Alonso was a curious one.

Chelsea strung five across the back, which created a Blue wall – at least until Alonso, still working has way back into English football, dropped a clanger moments later that earned him the ire, and a tongue-lashing, from Thibaut Courtois.

Taking off Eden Hazard and Willian did not reduce the work rate in this side, but doing it after that earlier switch in favour of Pedro and Michy Batchuayi, just looked confused.

A very odd set of decisions.

Costa already heading for a ban

Diego Costa vents his frustration

Diego Costa was one of the few who showed the passion expected in the shirt today.

But, in getting his fourth yellow of the season already – before September is up – he is only one card away from a ban.

At this rate he could miss a quarter of the season through yellow-card bans.